Dating british glass backstamps
Mark "A" represents the mark used between 18; mark "B" represents the mark between 18.After 1884, the diamond-shaped marks were replaced by the letters Rd. (for registered number)—and numbers indicating the year the piece was registered (see Mark "C).If the mark was used for many years, we may have to rely on other considerations in order to date the piece within the mark's span of years.(Website author's note: "considerations" would include manufacturing based diagnostic features - a primary goal of this website - and/or local research in to the user of the bottle, if that fact is known via embossing or labeling.) If the period of use of the mark was short, the age of the bottle may be pinpointed to a short period of time.Some glass containers make quite obvious which glass company made the item. This bottle was certainly made by the Cream City Glass Company (Milwaukee, WI.) which operated from 1888 to 1893, possibly at plant #1 as it is believed they had two separate plants at the same location and the number "2" has been observed on at least one other bottle with the same makers marking (Lockhart et al. This is typical of the type of makers marks found on the bases of mouth-blown beer bottles produced from the 1870s through the 1910s until National Prohibition and is an example of how useful makers marks can be for the accurate dating of historic bottles.For example, the quart canning jar pictured to the right is boldly embossed on one side with PACIFIC / SAN FRANCISCO / GLASS WORK (sic) making it easily clear that the jar was manufactured by the Pacific Glass Works of San Francisco, CA. (Photo courtesy of Bill Lockhart.)The following is quoted from the introduction to the book Bottle Makers and Their Marks by Dr.A diamond-shaped registry mark was used between 18.The information within the diamond changed after 1867.
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Diamond marks were issued by the Patent Office between 18.
They were issued with the registration number when a design was registered.